Fork a subset of ash/shelf for use in mash.

mash/shelf/shelf_button_host.h

Index: mash/shelf/shelf_button_host.h
diff --git a/ash/shelf/shelf_button_host.h b/mash/shelf/shelf_button_host.h
similarity index 60%
copy from ash/shelf/shelf_button_host.h
copy to mash/shelf/shelf_button_host.h
index b664c7f407777d18f7cad77671fb379c76f0b8ee..4111fdd2c797ec6c64426805f2e8b3e607d87e4e 100644
--- a/ash/shelf/shelf_button_host.h
+++ b/mash/shelf/shelf_button_host.h
@@ -2,11 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SHELF_SHELF_BUTTON_HOST_H_
-#define ASH_SHELF_SHELF_BUTTON_HOST_H_
+#ifndef MASH_SHELF_SHELF_BUTTON_HOST_H_
+#define MASH_SHELF_SHELF_BUTTON_HOST_H_
 
-#include "ash/ash_export.h"
+#include "base/logging.h"
 #include "base/strings/string16.h"
+#include "mash/shelf/shelf_types.h"
 
 namespace ui {
 class LocatedEvent;
@@ -16,11 +17,13 @@ namespace views {
 class View;
 }
 
-namespace ash {
+namespace mash {
+namespace shelf {
 
+// TODO(msw): Eliminate this abstraction and just pass pointers to ShelfView?
 // The shelf buttons communicate back to the host by way of this interface.
 // This interface is used to enable reordering the items on the shelf.
-class ASH_EXPORT ShelfButtonHost {
+class ShelfButtonHost {
  public:
   enum Pointer {
     NONE,
@@ -29,6 +32,29 @@ class ASH_EXPORT ShelfButtonHost {
     TOUCH,
   };
 
+  virtual ShelfAlignment GetAlignment() const = 0;
+
+  virtual bool IsHorizontalAlignment() const = 0;
+
+  // Helper function for choosing values specific to the shelf alignment.
+  template<typename T>
+  T PrimaryAxisValue(T horizontal, T vertical) const {
+    return IsHorizontalAlignment() ? horizontal : vertical;
+  }
+
+  // Helper function for choosing values specific to the shelf alignment.
+  template<typename T>
+  T SelectValueForShelfAlignment(T bottom, T left, T right, T top) const {
+    switch (GetAlignment()) {
+      case SHELF_ALIGNMENT_BOTTOM: return bottom;
+      case SHELF_ALIGNMENT_LEFT:   return left;
+      case SHELF_ALIGNMENT_RIGHT:  return right;
+      case SHELF_ALIGNMENT_TOP:    return top;
+    }
+    NOTREACHED();
+    return bottom;
+  }
+
   // Invoked when a pointer device is pressed on a view.
   virtual void PointerPressedOnButton(views::View* view,
                                       Pointer pointer,
@@ -60,6 +86,7 @@ class ASH_EXPORT ShelfButtonHost {
   virtual ~ShelfButtonHost() {}
 };
 
-}  // namespace ash
+}  // namespace shelf
+}  // namespace mash
 
-#endif  // ASH_SHELF_SHELF_BUTTON_HOST_H_
+#endif  // MASH_SHELF_SHELF_BUTTON_HOST_H_